Pump-operating mechanism for wafer-baking machines



R. E. BANER, E. H. FORD, AND I. ELLIOTT. PUMP OPERATING MECHANISM FOR WAFER BAKING MACHINES. APPLICATION FILED DEC-2.1918. 1,407,457, Patented Feb. zu, 1922.4

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H. E. BAKER. E. H. FORD, AND I. ELLIOTT.

P'UNIP OPERATl-NG MECHANXSM FOR WAFER BAKI'NG MACHlNES.

APPLICATION man Dic. 2. |918.

, 1,407,457. Patented Feb. 21, 1922.

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k 3 vwe wrom 05er? Elmer w' Wm R. E. BAKER, E. H. FRD, AND l. ELLIOTT.

PUMP OPERATING MECHANISM FOR WAFER B'AKING MACHINES. APPLICATIONILLED DEC. 2. |918.

1,407,457, rammed Fab. zn, 1922.

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wheel 33 will engage the second projection, 35, thereby automatically turning the shaft B2i to restore the member 31 to the locking position. i The molds, with the covers closed upon them, travel through a baking chamber formed with a hood 38 and heated in any suitable manner (say byV burners 39), andv the baked wafers or other articles are removed or allo-wed to drop olf as soonas the cover has been swung open, it being 'understood that 'the travel ofrthe Amolds is relatively slow. The mechanism so far described vis substantially the same asin the v Prescott patent referred to1 above.

Y ment to the one described and shown in Let* ters Patent of the United States No. 852,694

'issued tor George Samuel Baker on May 7,

1907. In the present case, however, we have shown a single-discharge pump instead of the Duplex pump shown in the Baker patent. The suction inlet 43 is suitably connected with a batter receptacle (not shown), and has a connection, controlled by a suction valve 44, with the main chamber 45 of the pump. From this chamber another connection, controlled by a delivery valve 46, leads to the discharge pipe 47 provided with a nozzle 48, said pipe and nozzle being rigid with the pump casing 42 and therefore moving in unison therewith. "Within the chamber 45 the piston 49 s mounted to slide in a direction parallel tol the guides 40, 41, that isi to say, arallel to path-of the pump casing 42. uring the greater part of the movement of the pump casing, the piston will move in unison therewith, but as the casing 42 nears either end of its stroke, a relative movement of casing and piston will be effected in the'following n'lanner: The

' piston 49 is provided with a rod 50 parallel ,to the guides 40, 4l and projectingfrom the casing 42 at'each end. The forward end ofthe piston rod 50 is adapted to engage a stationary abutment 51, toward the end 1 'of the, forward movement of the pump casing'r42, and toward the end of the return movement of said casing, the rear end of the piston rod is adapted to enga e a stationary abutment`52. Preferably t is abutmefnt is adjustable lengthwise, for which purpose `it maybe formed as a rodl journaledV and sliding ina stationary lbearing 53 andscrew-thre'aded in a normally stationary block 54, so that by turning the handle 55 y`the abutment rod 52 may be moved forward:

o r rearward in the block `54. 'In some cases held against longitudinal movement by aV locking pin'57 engaging a suitable'recess in said block.- The pin 57 is movable transversely, so asto enable it: to be thrown out of engagement-with the block V54, and may be mounted to slide in the casing or guide :56 as shown, being connected pivotally with.

a lever 58 mounted to swing about a stationary fulcrum 59 and provided with a handle 58. A spring 6() tends to throw the lever 58 and pin' 57 inward into the locking position. When the block 54 is released from the pin 57, a simple outward or rearward pull on thehandle 55 will cause the block Y 54 to slide in unison with the abutment rod 52, thereby enabling the latter to be removed quickly from the path of the piston rod 50l The following novel mechanism is Yprovided for reciprocating the pump casing 42 along the guides 40, 41: AtV its side, the casing 42 has a pivotal connection 61 with a rod 62 of considerable length, said rod extending forwardly iirst throughV a compartment 63 open to the outside air'and separated from the main or heating chamber of the Vhood 38 by a partitionV 64. The rod 62 then passes through a slot 65.V in the curved front wall 66 of said compartment and at its front end has a pivotal connection 67 with a crank arm 68 secured to a transverse shaft 69 j ournaled in a stationary bearing 70. The shaft 69 projects to the outside of the hood 38 and on its outer portion carries rigidly a toothed sector 71. The latter-is in mesh with a toothed sector 72 mounted loosely on a shaft 73 and provided with a roller or other projection 74 fitted into a continuous cam groove 75 of a disk 76. This disk is journaled onV a stationary stud 77 and is made with a. pinion 78 meshing with al toothed wheel 79 rigidly secured,v

to the shaft 73. j

The shaft 73 may also carry projections 8O for causing the conveyor or chain of molds to be moved continuouslyl in the direction indicatedy by the arrow. The drive `may be of any suitable kind, for instance, by

Vmeans of a beltpulley 81V moving in unison with a pinion82, in mesh with a gear wheel 83 on a shaft 84 also carrying a pinion Y85 meshing with'- av toothed wheel 86 rigid on the shaft 73. j y

The operation of the machine, and particularly of the pump-operating mechanism, -is as follows: Figs. 1 and'3 illustrate the' position of parts at the beginning of the return stroke of: therod .62 and pump casing 42 `(that-fis, attlie beginning of their movement toward Vthe right). The 'rollerorprojection 74isl'about to enter the steep or quick return portion of the cam groove 75, which will'cause the sector 'T2 to'turn quicklyin the direction indicated bythe arrowl (contraclockwise), producing a similarly quick movement of the sector-*71, arm 68, Irod 62, and;` pump casing 42. The latter moves tcwa'rd theright, carrying y'with it "the'pisto'n ligand its rod"50nntil the :latter strikesthe -abutment v52, Viif it is in operative position. rIh'is engagement `ofthe piston rod 50 with the abutment 52 occurs shortly b'efore'lthe parts reach the position shown in AF ig. 4, which illustrates the l"end of the return stroke. As the rod 50 and piston 49 are held stationary by the abutment 52 while the v"pui'np Vcasing 42 continues to move toward the `right,the sizeof `the main pump chamber 'Y 45 is increased, thus :producing suction'wliich will cause batter fto be 'drawn into said chamberthroughfthe inlet '43 and past the valve 44. t the `end ofY the .return stroke, the parts have reached the, position shown in Fig, J4, and vthen follows the forward stroke Kto vthe lett), either immediately, or'after a short interval during which the pump casing remains stationary, if 4the cam groove 7 5jis made 'with 'a short portion concentric withthestud 77 as shown'iininediately above the-projection 74 inf Fig. '4. During this 'forxva.rd"s`troke, the piston 49 and rod 50 will move in unison with 'the pu'inpoasing 42 untill the left-hand end of thero'd 50 engages the labutment 51. vFrom this wmoment on, the .pump casing 42 will move alone-toward theleft, the piston 49 remtaining stationary. The relative movement of pump casing Vand piston thus obtained will reduce the volumeot'the main chamber 45 and consequently 'expel -ther4'contents vof said chamber.` through thej delivery valve 46, discharge pipe47 ,and nozzle 48 into the open mold or plate 27 which atthat time is movin@ under said nozzle. It will be noted that the cam portion which effects the forward or delivery stroke of the pump casing 42 is comparatively shallow, that is to say, its circumferential or angular extent is considerably greater than that of the steep cam portion which effects the return or suction stroke of the pump casing 42.. It is desirable that the delivery of the batter through the nozzle 48 should continue for a relatively long period, so that the batter may be thoroughly distributed throughout the length of the mold or plate 27. On the other hand, a quick action of the pump on the suction stroke will conduce to eiiiciency in filling the main chamber 45 with batter.

It will be noted (see particularly Fig. 8) that one face of the piston 49 forms a movable Wall of the chamber 45, the Other e (atthe lett in Fig 8) being exposed to the latmosphere. Preferably, on this side, an additional guide is 'provided for the piston rod '50, say by Vsecuringt'o the casing 42 a cross bar' 42"throughth"e central portion of which thepiston rod `is'adapted to slide.

` 'Tlie'toothed sectors Tl'and 72 are in mesh atalltime'siduring the operation of the machi'nefthfus insuring proper working of the parts. These sectors, as well the projection74 and Cani 4IGwvith its drive 78,75), are locat-e'dieXterioi-ly of tl'iebaking chamber and eiiposcdfto the -coolifng influence ol' the outside air, 'so'thattheSe' parts are not liable to be w'arpedforotherwise affected injuriously by the heat'applied to theibakng chamber. Itwilltbe understood that after a .mold or platef27 has'received itsv supply of batter Ifrom'the` 'pumlnthe cover 30 ot' said mold or plfate iscl'osed automatically by thejaction fthe 'guide 3'7, andthe closed mold passes through the baking chamber, wafers lare removed, or allowed `to drop out, when tlieguide 3 7 jagain swings the cover 3() into the open 'position i 'By'tnrningthehandle55J the abutment 52 maybefadjusted lengthwise to vary the effective suctionv stroke of the pump, and therefore the amount of batter drawn in and deliveredatfeach complete (to and fro) reciprocation of' thelpum'p casing 42. It it is desired "to stop the supply of batter temporarily (as'i'n testingtheoperation of the Qtherparts of the machine), the abutment 52'may'be removed entirely 'from the path f'yth'e ,piston rod 50, either "by continued turning of the adjustinghandle or prc'terably "(since this is quicker) by moving the 4pinf out of its locking position and then slidingfthe 'block 54 and abutment 52 outwardly (to, the right).

)Ye claim as your1invention: fil, lua machine of the c'lassdescribed, a conveyor,v Y a ,guiderv `ranging lengthwise o' said conveyor, a pump barrel movable along said guide and adapted to discharge material on articles carried by said conveyor, a piston arranged to travel within said barrel in the same direction in which the pump barrel moves and provided with a rod projecting at each end of the barrel, stationary abutments adapted to engage the ends of the piston rod and to cause a relative movement of the piston within the barrel as the latter continues to move after such enga-gfement, a shaft in operative connection with the conveyor, a rocker operated by said shaft, and an operative connection between the rocker and the pump barrel, to cause the latter to reciprocate along said guide.

2. In a. machine of the class described, a conveyor, a guide ranging lengthwise of said conveyor, pump mechanism movable along said guide and adapted to discharge The uba ked materia-lyon articles carried. by said. conve-yor, a shaft in operative connection with said guide.

saidconveyor, a rocker operated bv said shaft, another` rocker in permanent riving connectionwith the irst-named rocker, and an operative connection between the second rocker and the pump mechanism to cause the latter to reciprocate along said guide.

3.v In a machine of the class described,a conveyor, `a vguide ranging lengthwise O along said guide and adapted to` discharge material lon articles carried` by said 4conveyor, a shaft in operative connection withV said conveyor, a rotary cam operated by said shaft, a toothed rocker Operated by said cam, another toothed rocker 4 permanently in mesh with the first-named rocker, and an operative connectionbetvvn ythe second-named rocker and the pump mechanism to cause the latter-toreciprocate along 4. In a machine of the class described,i`a conveyor, a guide ranging lengthwiseof said conveyor, pump mechanism` movable'along said guide and adapted` to `discharge materialon articles carried by said conveyor, a toothed rocker in. permanent operative connection Y with` the conveyor,v and another toothed rocker, in permanent mesh .with'the iirst-named rocker and in vpermanent operative connection with said pump mechanism to cause the latter to reciprocate along said guide. l 5. In a machine of the character de` scribed, a conveyor, a chamber Athrough which said conveyor passes at a'portionof its path, ai guide ranging Alengthwise olifanother portion of the conveyors path, pump mechanism movable along said guide and adaptedto discharge materialr onfarti'cles carried by said conveyor, rotary mechanism located eXteriorly of said chamber andin` permanent operative connection with the conveyor, a rocking device in permanent operative f connection With-the said rotary mechanism and extending from the` latter V into said chambeiyanda connecting rod extending from said rocking device length- 6J In a machineoi character scribed, a conveyor,.a guide ranging length- Wise of said Y conveyor, a" pump movable along said ,guide and adaptedto discharge material on thearticles carried` Vby the conveyor, said pump includinga member movlable relatively, to other parts ofthe pump, abutments located the path of said member to engage the same andproduce suction and delivery,means1whereby one of .said abutments may, be adjustedlengthwise or' the path` of the pump to vary the output of the 'pump, and means yfor' releasing said abutment so that .it may oppose no resistanceto the said member and allov'v thepump to movev Without pumpingaction.V

7.1 In a machine` of theV character 'described, a conveyor, aguide ranging length- Wise ofthe conveyor, a pump movable along Y saidA "pump including a member movable relatively to the other parts'off the pump, abutments located in the path of'said member to engage thesame and produce suction and delivery, a normally stationary block carryingone 'of said abutments and slidable bodily With the abutment, when the block is released, ina direction "parallel to the path of the pump, screw mechanism for adjusting said abutment relativelyftosaid block, and means for lockingV the block normally against sliding movement. 'jf ,n I ntestimony whereof "We have s ignedthis specification. f ROBERT ELMER BAKER. "EARDLEY HARRY FORD. i n' AI RVVfINfELLIOIT. `v 

